Division of Physical Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Office of Scientific Instrument and Testing, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand.
Int J Biol Macromol. 2021 Jan 15;167:130-140. doi: 10.1016/j.ijbiomac.2020.11.157. Epub 2020 Nov 27.
The study focuses on structure-properties relationships in thermoplastic cassava starch (TPS) based biocomposites comprising 5-20 wt% of untreated and treated rice husk (RH). Alkaline treatment with 11% w/v NaOH removed the hemicellulose layer of RH as confirmed by Fourier-transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA), and resulted in a larger population of -OH groups exposing on the fibril surface. Consequently, the filler-matrix interactions between treated RH and TPS were enhanced, although Brunauer-Emmett-Teller (BET) surface area analysis indicated that the surface area of treated RH was not increased. Interestingly, the biocomposites contained 20 wt% treated RH showed substantially improved tensile strength by a factor of 220% compared to the neat TPS. The biocomposite at 15 wt% treated RH showed high water absorption. TPS with all treated RH contents showed high biodegradation rate, while the thermal stability of the TPS/treated RH biocomposites was slightly decreased. These novel composites showed promising properties for applications as absorbents.
本研究关注热塑性木薯淀粉（TPS）基生物复合材料的结构-性能关系，该复合材料包含 5-20wt%未经处理和处理的稻壳（RH）。用 11%w/v 的 NaOH 进行碱性处理，如傅里叶变换红外光谱（FTIR）和热重分析（TGA）所证实的，去除了 RH 的半纤维素层，并且在纤维表面上暴露了更多的-OH 基团。因此，尽管 BET 表面积分析表明处理后的 RH 表面积没有增加，但处理后的 RH 与 TPS 之间的填料-基质相互作用得到了增强。有趣的是，含有 20wt%处理后的 RH 的生物复合材料的拉伸强度比纯 TPS 提高了 220%。在 15wt%处理后的 RH 下，生物复合材料的吸水率很高。所有添加了处理后的 RH 的 TPS 都显示出很高的生物降解率，而 TPS/处理后的 RH 生物复合材料的热稳定性略有下降。这些新型复合材料具有作为吸收剂的应用前景。
